Journal of Materials Science

, Volume 26, Issue 14, pp 3769–3774

Microstructure and mechanical properties of hot-pressed SiC-TiC composites

  • H. Endo
  • M. Ueki
  • H. Kubo
Papers

DOI: 10.1007/BF01184969

Cite this article as:
Endo, H., Ueki, M. & Kubo, H. J Mater Sci (1991) 26: 3769. doi:10.1007/BF01184969

Abstract

Hot-pressed SiC-TiC composite ceramics with 0–100 wt% TiC have been investigated to determine the effect of composition (amount of TiC) on the elastic modulus, hardness, flexural strength and fracture toughness,KIC. The composites exhibited superior mechanical properties compared to monolithic SiC and TiC, especially in fracture toughness,KIC, value for 30–50 wt% TiC composite. The maximum values ofKIC and room-temperature flexural strength were 6 MPa m1/2 for a 50 wt % TiC and 750 MPa for a 30 wt% TiC composite, respectively. The observed toughening could be attributed to the deflection of cracks due to dispersion of the different particles. Although no third phases were detected by both TEM and XRD studies, an EDAX study and resistivity measurements indicated some possibility of solid solutions being present. The composites containing more than 30 wt% TiC, exhibited resistivity lower than 10−3Ω cm which is favourable for electro-discharge machining of ceramics.

Copyright information

© Chapman and Hall Ltd. 1991

Authors and Affiliations

  • H. Endo
    • 1
  • M. Ueki
    • 1
  • H. Kubo
    • 1
  1. 1.R and D Laboratories-INippon Steel CorporationKawasaki 211Japan

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